In 30 seconds, an electric device delivering a current of 15.0 A allows approximately 2.81 x 10^21 electrons to flow through it. This is calculated by finding the total charge in coulombs and then converting that charge to the number of electrons using the charge of a single electron. The total charge is found using the formula Q = I * t, where Q is charge, I is current, and t is time.
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One Coulomb of electrons per second is One Ampere.
One Coulomb = 6.241 x 10^18 electrons
SO:
6.241 x 10^18 * 15 * 30 = 2.81 x 10 ^21 electrons ;